CHI01LA132

NTSB accident investigation · Maule M-7-235B · Lake City, MI · May 5, 2001

Accident · Minor injuriesLimited investigationFinal report
Date
May 5, 2001, 18:32 local (22:32 UTC)
Place
Lake City, MI
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N744LSMaule M-7-235B
Weather
Visual (VMC) · Day
Status
Completed · report November 23, 2001
Report
Approved by Office Director
Parties
FAA
FAA report
20010505007429A
Case key
52238

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

the improper installation of the left landing gear hydraulic line which allowed it to separate and port the hydraulic fluid. This resulted in the landing gear extending during a water landing.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Wheels down landing in waterLanding
Maintenance,installation - improperOther maintenance personnelCause
Hydraulic system,fitting - separationCause
Fluid,hydraulic - exhaustionCause
Gear extension - inadvertent
Nose overLanding

Analysis

The airplane nosed over during the water landing with the wheel extended. The pilot reported that after takeoff from the lake, he was unable to lower the landing gear in preparation for a hard surface landing. He returned to the lake where he recylced the gear and performed emergency procedures to verify the gear was retracted. The pilot reported that he thought the gear was retracted prior to touchdown. He reported that as he slowed the airplane, the force of the water pulled the landing gear down and the airplane nosed over. Inspection of the airplane after the accident revealed that the hydraulic line to the left gear had separated porting the hydraulic fluid. It was determined that the hydraulic line was not properly flared at the fitting.

Factual narrative

On May 5, 2001, at 1832 eastern daylight time, N744LS, a Maule M-7-235B floatplane, operated by a private pilot, flipped over and sank while landing on Lake Missaukee, near Lake City, Michigan. The pilot and two passengers received minor injuries. The airplane was substantially damaged. The 14 CFR Part 91 personal flight was operating in visual meteorological conditions without a flight plan. The flight originated from Lake Missaukee, at about 1815 eastern daylight time.

The pilot reported that he departed Lake Missaukee en route to Cadillac, Michigan for fuel. He reported that upon lowering the gear in preparation for landing at Cadillac, he was unable to get a gear down indication. He then returned to Lake Missaukee to land. He reported that he cycled the landing gear selector and the circuit breaker four times. The pilot reported that prior to landing he pulled the circuit breakers, moved the selector to the gear up position, pumped the gear switch motor to the up position, pumped the gear hydraulic pump 15 to 20 times with positive pressure and turned the gear selector switch to off. He reported that he thought the gear was in the retracted position prior to landing.

The pilot reported that upon landing as he slowed the airplane, the force of the water pulled the landing gear down and the airplane nosed over.

Inspection of the airplane after the accident revealed that the hydraulic line to the left gear had separated porting the hydraulic fluid. It was determined that the hydraulic line was not properly flared at the fitting.

Aircraft

Registration
N744LS
Reported as
Maule M-7-235B
Category
Airplane
Serial number
23010C
Engine
Lycoming O-540, 235 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Robert A. Anton
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 8, 2000
Departed
CAD · Cadillac, MI
Destination
Lake City, MI

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
43
Injuries
None
Medical
Class 3, Valid Medical--w/ waivers/lim
Last flight review
March 14, 2001
Seat
Left
Flight hours
138 total · 29 in this make and model · 28 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
110° at 14 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
61 °F, dew point 23 °F
Altimeter
30.22 inHg
Observed at
CAD, 6 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.